Company · Ownership research

Gossamer Bio, Inc. GOSS

CIK 0001728117 · CUSIP 38341P102

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 38341P102 (GOSS), not CUSIP 38341P902 (GOSS), CUSIP 38341P952 (GOSS), and does not merge CUSIPs.

This page lists the top 20 of 185 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$5.53M 16,826,695 shares	0.00%	-230.18K(-1.30%)Reduced	SEC filing ↗ May 13, 2026	▾
02	Kalehua Capital Management LLC CIK 2106181 · Amended · View history	$3.36M 10,236,293 shares	2.38%	+10.24MNew	SEC filing ↗ May 15, 2026	▾
03	AQR CAPITAL MANAGEMENT LLC CIK 1167557 · View history	$3.33M 10,126,897 shares	0.00%	+9.01M(+804.80%)Added	SEC filing ↗ May 15, 2026	▾
04	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$3.09M 9,394,593 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
05	ARCH Venture Management, LLC CIK 1274403 · View history	$2.65M 8,055,916 shares	0.39%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
06	Octagon Capital Advisors LP CIK 1839435 · View history	$2.55M 7,750,000 shares	0.28%	-6.17M(-44.30%)Reduced	SEC filing ↗ May 15, 2026	▾
07	Samsara BioCapital, LLC CIK 1744967 · View history	$2.37M 7,222,559 shares	0.23%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
08	Balyasny Asset Management L.P. CIK 1218710 · View history	$1.95M 5,922,298 shares	0.00%	+4.41M(+290.50%)Added	SEC filing ↗ May 15, 2026	▾
09	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$1.73M 5,277,904 shares	0.00%	+861.00K(+19.50%)Added	SEC filing ↗ May 13, 2026	▾
10	Siren, L.L.C. CIK 2005245 · View history	$1.71M 5,208,968 shares	0.05%	0(0.00%)Unchanged	SEC filing ↗ May 14, 2026	▾
11	683 Capital Management, LLC CIK 1404574 · View history	$1.64M 5,000,000 shares	0.15%	-190.80K(-3.70%)Reduced	SEC filing ↗ May 15, 2026	▾
12	HHLR ADVISORS, LTD. CIK 1762304 · View history	$1.63M 4,974,041 shares	0.10%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
13	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$1.62M 4,939,691 shares	0.00%	+66.98K(+1.40%)Added	SEC filing ↗ May 15, 2026	▾
14	Qube Research & Technologies Ltd CIK 1729829 · View history	$1.62M 4,917,763 shares	0.00%	+4.38M(+809.70%)Added	SEC filing ↗ May 15, 2026	▾
15	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$1.57M 4,780,851 shares	0.00%	+1.38M(+40.70%)Added	SEC filing ↗ May 15, 2026	▾
16	STATE STREET CORP CIK 93751 · View history	$1.44M 4,388,109 shares	0.00%	-4.92M(-52.90%)Reduced	SEC filing ↗ May 15, 2026	▾
17	Corient Private Wealth LLC CIK 1948780 · View history	$1.31M 3,985,383 shares	0.00%	+139.50K(+3.60%)Added	SEC filing ↗ May 15, 2026	▾
18	Squarepoint Ops LLC CIK 1642575 · View history	$1.12M 3,398,757 shares	0.00%	+3.18M(+1,433.80%)Added	SEC filing ↗ May 15, 2026	▾
19	GSA CAPITAL PARTNERS LLP CIK 1362033 · View history	$1.07M 3,254,233 shares	0.07%	+3.20M(+6,175.00%)Added	SEC filing ↗ May 8, 2026	▾
20	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$1.04M 3,173,725 shares	0.00%	+1.27M(+66.50%)Added	SEC filing ↗ May 18, 2026	▾

Showing 20 / 185 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

185

Cancelled or null records excluded

Disclosed shares

169,802,099

Not deduplicated across managers

Disclosed value

$56.31M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Gossamer Bio, Inc. · Q1 2026

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.